There's nothing better under the sun to challenge kids to learn about solar energy, science and robotics, while having tons of fun! Beginners jump right in, to make seven different “bots," from Wheel-Bot to Beetle-Bot. When they're ready to advance, there are seven more challenges including Zombie-Bot and Crab-Bot. The transparent gear housing is fascinating, and the solar panel features adjustable polarity for changes in direction. From Elenco Electronics Inc, for ages 10 yrs-adult.